Why is the 24hr clock named '24 hr' when it never shows 24:00?

Why is the 24hr clock named '24 hr' when it never shows 24:00? 24hr 24hr Bookkeeper specializes in accounting for construction companies 24hrs The Hospitality Virtual 24hr Relay is a team event and means participants running or walking in 1 hour time slots one after each other with the aim for the team

24hrs 24hr Healthcare We have staff available 24 hours a day, 7 days a week We operate nationwide and have vacancies throughout the UK

sbo24hr Shop M·A·C Cosmetics Locked Kiss™ 24HR Lipstick – our breakthrough, longest-wearing matte lipstick that wears for 24 hours! This new formula delivers A self supported 24hr run around the Blue Lake in Rotorua